P0632 OBD-II Trouble Code: Odometer Not Programmed – ECM/PCM

P0632 code definition

The P0632 trouble code detects that the PCM is unable to read the odometer.

What the P0632 code means

The P0632 code is a generic, but fairly uncommon OBD-II trouble code that signals an odometer issue. In the case of the P0632 code, the powertrain control module (PCM) is unable to recognize the reading from the odometer.

What causes the P0632 code?

The P0632 trouble code is almost always caused by a PCM that needs reprogramming.
This can occur because:

The PCM was replaced or repaired without being reprogrammed

The battery in the vehicle became discharged

Damaged electrical components, such as wires, connectors, and fuses

Defective PCM.

What are the symptoms of the P0632 code?

A vehicle with the P0632 trouble code will usually have an illuminated Check Engine Light on the gauge cluster. In most cases, the vehicle will be incapable of starting.

How does a mechanic diagnose the P0632 code?

The P0632 code will be diagnosed using a standard OBD-II trouble code scanner. A certified technician can assess the code using the freeze frame data from the scanner, and can also check for any additional trouble codes that are present. If the mechanic notes multiple trouble codes, then they will need to be addressed in the order in which they are displayed. The mechanic should then reset the trouble codes, restart the vehicle, and test to see if the P0632 code remains. If the code does not remain, then it was probably in intermittent error, or an inaccurate trigger.

If the P0632 trouble code remains, then the mechanic will visually inspect the electrical system, and replace any blown fuses, loose or corroded connectors, or short or open wires. Next, the mechanic will need to find out the history of the PCM, to know if it requires programming. If the PCM was recently replaced or repaired, then a reprogram will almost surely fix the issue. If not, the mechanic should ask the vehicle’s owner if the battery has died recently; if it has, then a reprogram is in order. If none of these things have occurred, then the PCM will need to be replaced.

After any component is replaced or reprogrammed, then the mechanic should again reset the trouble codes, restart the vehicle, and check to see if the P0632 code is still present. This helps the technician know as soon as the code has been resolved.

Common mistakes when diagnosing the P0632 code

The most commonly made mistake when diagnosing this code comes from a failure to follow the OBD-II trouble code protocol. It’s important for mechanics to always abide by the protocol in step-by-step order, to avoid erroneous repairs, and ensure an efficient inspection.

Often PCMs are replaced without first checking to see if they merely require reprogramming.

How serious is the P0632 code?

In most cases, a vehicle with the P0632 will refuse to turn on, so the car should be inspected as soon as possible.

What repairs can fix the P0632 code?

Repairs for the P0632 trouble code are:

Reprogramming of the PCM

Replacement of the electrical components

Replacement of the PCM

Additional comments for consideration regarding the P0632 code

If the PCM does require replacement, it will also need to be reprogrammed upon installation.

Need help with a P0632 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

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